CVE-2023-44487

HTTP/2: Multiple HTTP/2 enabled web servers are vulnerable to a DDoS attack (Rapid Reset Attack)

The HTTP/2 protocol allows a denial of service (server resource consumption) because request cancellation can reset many streams quickly, as exploited in the wild in August through October 2023.

CVSS 3.1 · 7.5 High EPSS 100.0% KEV · Listed

Vendors

Akka Amazon Apache and 30 more

Products

Http Server Opensearch Data Prepper Apisix and 375 more

CVE-2026-14614

Keycloak-services: keycloak-services: fgap v2 client scope assignment bypass via clientresource

A flaw was found in the ClientResource component of Keycloak's admin services when Fine-Grained Admin Permissions (FGAP) v2 is enabled. This issue allows a delegated administrator, who should only have limited control over specific clients, to attach or remove hidden client scopes that they are not authorized to see or manage. As a result, an attacker could inject unauthorized data or permissions into the security tokens issued to end-users, potentially tricking other applications into granting higher levels of access than intended.

CVSS 3.1 · 5.4 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-11986

Keycloak-rest-admin-ui-ext: authorization bypass vulnerability in the admin-ui-ext bulk role-mapping-delete endpoints of keycloak

A flaw was found in the admin-ui-ext component of Keycloak, which provides extended administrative user interface capabilities. The issue occurs because certain bulk role-removal endpoints fail to perform granular permission checks when deleting role mappings. This allows a delegated administrator with limited permissions to remove highly privileged roles from other users or groups, potentially disrupting administrative access control.

CVSS 3.1 · 4.9 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Jboss Enterprise Application Platform Expansion Pack and 1 more

CVE-2026-16100

Keycloak-services: keycloak-services: unbounded metric cardinality in user event metrics via request-controlled error text

A flaw was found in the user-event metrics recording of Keycloak. When metrics are enabled, the system records raw error messages from failed account operations as Prometheus metric labels. Because these error messages can include user-supplied input like nonexistent client IDs, an authenticated user can create a massive number of unique metric entries, eventually exhausting system memory and causing the service to crash or become unavailable.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid 8 and 5 more

CVE-2026-16442

Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction

A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account.

CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid 8 and 5 more

CVE-2026-16443

Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation

A flaw was found in the SAML metadata import functionality of the keycloak-services component, which is the core engine for identity brokering in Red Hat Build of Keycloak. When importing identity provider metadata that lacks specific usage attributes for keys, the system incorrectly disables signature validation for SAML responses even if a signing certificate is provided. This issue allows an unauthenticated attacker to forge a SAML response and gain unauthorized access to a user account by knowing their external identifier.

CVSS 3.1 · 7.4 High EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid 8 and 5 more

CVE-2026-18967

Keycloak-services: keycloak-services: saml onetimeuse assertion replay in idp-initiated broker flow

A flaw was found in the SAML broker component of Keycloak, an identity and access management solution. When configured as a SAML broker using the IdP-Initiated flow, Keycloak fails to enforce the OneTimeUse condition in SAML assertions. This allows an attacker who captures a valid, unused assertion to replay it multiple times. Successful exploitation could allow an attacker to hijack a user's session and gain unauthorized access to the system as that user.

CVSS 3.1 · 6.4 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Jboss Enterprise Application Platform Expansion Pack and 3 more

CVE-2026-14209

Keycloak-admin-ui: keycloak-admin-ui:admin ui extension brute-force-user endpoint bypasses fgapv2 user view restrictions

A vulnerability was discovered in Keycloak's Admin UI extension that allows certain administrative users to bypass security restrictions. When Fine-Grained Admin Permissions (FGAPv2) are enabled, an administrator who should only be able to search for users (but not view their full details) can use a specific "brute-force-user" endpoint to access a user's full profile. This includes sensitive information and security metadata. The issue occurs because the system fails to check if the administrator has the required "view" permission for that specific user when using this particular search path.

CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Jboss Enterprise Application Platform Expansion Pack and 1 more

CVE-2026-18211

Keycloak-services: keycloak-services: secure-client-uris policy bypass via localhost-prefixed domains

A flaw was found in the secure-client-uris client policy executor within Keycloak core services. This component is responsible for enforcing security requirements on client configurations, such as requiring encrypted connections for redirect URIs. Due to an improper check that only looks at the start of a web address rather than properly verifying the host, an attacker can bypass these security restrictions by using a specially crafted domain name. This could allow an attacker to intercept sensitive authentication codes over unencrypted connections.

CVSS 3.1 · 4.2 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-14781

Keycloak-services: keycloak-services: oidc email_verified claim incorrectly applied to userinfo email

A flaw exists in the org.keycloak.broker.oidc package where the OIDC broker incorrectly synchronizes the email_verified claim. When an OIDC identity provider is configured with trustEmail=true and the userinfo endpoint is enabled, Keycloak retrieves the email address from the userinfo response but retrieves the email_verified status exclusively from the id_token. The root cause is a lack of validation ensuring that the email_verified claim in the id_token actually refers to the email address returned by the userinfo endpoint. If these two sources return different email addresses, the id_token's email_verified=true claim is blindly applied to the userinfo email. Exploitation Conditions: The OIDC identity provider must have trustEmail set to true (non-default). The userinfo endpoint must be enabled (default). The attacker must control or have compromised the upstream OIDC provider. Concrete Impact: Mark arbitrary email addresses as verified in the Keycloak database. Bypass email-based security controls or verification workflows. Potential account takeover if the application relies solely on the email_verified flag from the IdP to link accounts.

CVSS 3.1 · 4.8 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 5 more

CVE-2026-1609

Org.keycloak/keycloak-quarkus-server: keycloak: unauthorized access via jwt authorization grant with disabled users

A flaw was found in Keycloak. When the JSON Web Token (JWT) authorization grant preview feature is enabled and a user account is disabled, Keycloak fails to validate the user’s disabled status during JWT authorization grant processing. A remote attacker with low privileges can exploit this improper access control vulnerability by presenting a valid assertion token from an external identity provider to obtain a JWT for a disabled user. This allows unauthorized access to sensitive resources.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed

Vendors

Keycloak Redhat

Products

Keycloak-quarkus-server Build Of Keycloak Jboss Enterprise Application Platform and 1 more

CVE-2025-12799

Jastow: jastow cross-site scripting attack due to unsanitized uri

A flaw was found in Jastow. Jastow is vulnerable to Cross-Site Scripting (XSS) attack. If using a set of combined configuration to allow unescaped characters in URL with embedded Undertow and Jastow, a server might be vulnerable to improper input handling.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Jboss Enterprise Application Platform Jbosseapxp Red Hat Single Sign On

CVE-2026-11800

Org.keycloak:keycloak-services: keycloak: authentication bypass via jwt algorithm confusion

A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.

CVSS 3.1 · 8.1 High EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Data Grid and 4 more

CVE-2026-4874

Org.keycloak.protocol.oidc.grants: org.keycloak.services.managers: keycloak: server-side request forgery via oidc token endpoint manipulation

A flaw was found in Keycloak. An authenticated attacker can perform Server-Side Request Forgery (SSRF) by manipulating the `client_session_host` parameter during refresh token requests. This occurs when a Keycloak client is configured to use the `backchannel.logout.url` with the `application.session.host` placeholder. Successful exploitation allows the attacker to make HTTP requests from the Keycloak server’s network context, potentially probing internal networks or internal APIs, leading to information disclosure.

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Jboss Enterprise Application Platform and 4 more

CVE-2025-2251

Org.jboss.eap:wildfly-ejb3: improper deserialization in jboss marshalling allows remote code execution

A security flaw exists in WildFly and JBoss Enterprise Application Platform (EAP) within the Enterprise JavaBeans (EJB) remote invocation mechanism. This vulnerability stems from untrusted data deserialization handled by JBoss Marshalling. This flaw allows an attacker to send a specially crafted serialized object, leading to remote code execution without requiring authentication.

CVSS 3.1 · 6.2 Medium EPSS 1.1% KEV · Not listed

Vendors

Redhat

Products

Jboss Enterprise Application Platform Jbosseapxp

CVE-2026-4366

Keycloak-services: blind server-side request forgery (ssrf) via http redirect handling in keycloak

A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.

CVSS 3.1 · 5.8 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Jboss Enterprise Application Platform and 4 more

CVE-2012-4550

Jboss enterprise application platform: jboss eap: jbeap: jboss enterprise application platform: unauthorized ejb access via authorization module bypass

A flaw was found in JBoss Enterprise Application Platform. When role-based authorization is used for Enterprise Java Beans (EJB) access, the system does not correctly call the necessary authorization modules. This prevents Java Authorization Contract for Containers (JACC) permissions from being applied, allowing remote attackers to gain unauthorized access to EJBs.

CVSS 3.1 · 5.3 Medium EPSS 2.1% KEV · Not listed

Vendors

Redhat

Products

Jboss Enterprise Application Platform Jbosseapxp

CVE-2012-4549

Jboss enterprise application platform: org.jboss.as.ejb3: jboss enterprise application platform: access restriction bypass via improper ejb method authorization

A flaw was found in JBoss Enterprise Application Platform. The `processInvocation` function within the `org.jboss.as.ejb3.security.AuthorizationInterceptor` component incorrectly authorizes all requests when no roles are defined for an Enterprise Java Beans (EJB) method invocation. This allows attackers to bypass intended access restrictions for EJB methods, leading to unauthorized access to sensitive functionalities.

CVSS 3.1 · 6.5 Medium EPSS 1.3% KEV · Not listed

Vendors

Redhat

Products

Jboss Enterprise Application Platform Jbosseapxp

CVE-2025-7784

Org.keycloak/keycloak-services: privilege escalation in keycloak admin console (fgapv2 enabled)

A flaw was found in the Keycloak identity and access management system when Fine-Grained Admin Permissions(FGAPv2) are enabled. An administrative user with the manage-users role can escalate their privileges to realm-admin due to improper privilege enforcement. This vulnerability allows unauthorized elevation of access rights, compromising the intended separation of administrative duties and posing a security risk to the realm.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Build Of Keycloak Jboss Enterprise Application Platform and 2 more

CVE-2026-1190

Org.keycloak/keycloak-services: keycloak saml brokering: response delay due to unchecked notonorafter in subjectconfirmationdata

A flaw was found in Keycloak's SAML brokering functionality. When Keycloak is configured as a client in a Security Assertion Markup Language (SAML) setup, it fails to validate the `NotOnOrAfter` timestamp within the `SubjectConfirmationData`. This allows an attacker to delay the expiration of SAML responses, potentially extending the time a response is considered valid and leading to unexpected session durations or resource consumption.

CVSS 3.1 · 3.1 Low EPSS < 1% KEV · Not listed

Vendors

Redhat

Products

Build Keycloak Jboss Enterprise Application Platform Jbosseapxp and 1 more